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V SLIDING DOOR LOOK. No. 352,018. Patented Nov. 2, 1886.

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UNITED STATES PATENT OFFICE.

CHARLES J. WHITMORE, OF DE WITT, NEW YORK.

SLIDING-DOOR LOCK.

SPECIFICATION forming part of Letters Patent N0. 352,018, dated November 2, 1886.

Application filed May 6, 1886. Serial No. 201,347. (No model.)

To all whom it may concern..-

Be it known that 1, CHARLES J. WHITMoEE, a citizen of the .United States, residing at De Witt, in the county of Onondaga, State of New York, have invented certain new and useful Improvements in Sliding-Door Locks, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to an improved lock, especially adapted to use upon sliding doors.

My object is to obtain a lock which will prove difficult to operate to those unaware of its construction; and to that end the invention consists of certain novel devices and combination of devices, as will be described and claimed.

. Reference will be made to the accompanying drawings, in which Figure 1 is a face View of the lock with part of the casing removed; Fig; 2, a detail of the latch; Fig. 3, a detail of the tumbler; Fig. 4, a detail of the key; and Fig. 5 is a vertical section through the look, a section of the door being also shown therein.

Like letters refer to like parts in each view.- A and A represent the two parts of 'the lock-casing, the same being held together by.

a single screw passed through the opening a in Fig. 1. Through each corner of each section of the casing there is formed an opening,

, through which screws are passed to secure the same to the inner face of the door B, the side A of the casing pressing against the door and the side A facing the interior of the car. Pivoted to a stud formed on the inner face of part A is a latch, O, which protrudes through an opening left between the two parts of the casing, and at its outer end is provided with a hook adapted to engage with a suitable loop secured to the other door or the door-post. This latch is held to its lowest position by means of a spring, D, which at one end rests upon the top of said latch, and at its opposite end is secured in suitable bearings, b, secured to the inner face of part A, all as clearly seen in Fig. 1. There is an opening formed through part A of the casing, which is directly below the latch when forced to its lowest position. Situated in this opening, and having any suitble bearing in the part A, is a tumbler, E, which consists of a solid shaft provided with a short tongue or projection formed at a right angle thereto. In that end of the shaft which is inserted into the opening in part A there are formed two small openings, 0, which are brought into line with a socket, d, formed in the front face of the door.

F represents the key, which consists of a suitable shank provided at one end with two studs or pins, 6. adapted to fit into the opening a of the tumbler E.

By the arrangement of parts thus far de scribed it will be seen that as the pins of the key are inserted into the openings of the tumbler and turned the tongue of such tumbler will be brought into contact with the latch, which it will raise until it becomes disengaged from the loop on the next door; but it will be seen that butabout a quarter-revolution is necessary to obtain this result. In ordinary looks, when the same are unlocked or locked, there is a snapheard, which is an indication that the desired result has beenobtained; but in this look, when such snap is heard, instead of the lock being unfastened, the tumbler has been carried away from the latch and the same is locked again. I suppose I might find it desirable to form a handle, G, on the latch, said handle protruding into the interior of the room or car on which the lock is used, and through it the parts may be unlocked. However, I prefer to have the tumbler provided with its openings at each end, so that a key can be used either inside or out.

It may be possible with the lock described to insert a knife or other thin instrument between the doors and raise the latch. To obviate this difliculty I form upon the rear end of the latch an arm, H, curved as shown in dotted lines, and notched on its free end. By turning the tumbler to engage with this notch, as indicated in Fig. 1, the latch cannot be raised without employing the key to disengage the tumbler. I

What I claim isv 1. The combination, with the tumbler E, of the latch 0,. formed with notched arm H, adapted to engage said tumbler, and spring D, substantially as described.

2. The combination, with latch 0, formed 

